Find the missing number in the series 3, 7, 24, 11, ___, 19, 19, ..... - www.mathselab.com

Find the missing number in the series? 3, 7, 24, 11, ___, 19, 19, …..

Question


Find the missing number in the series?

3, 7, 24, 11, _, 19, 19, …..


A. 21
B. 16
C. 15
D. 13


Answer: C. 15


Solution:


Two series alternate here, with every third number following a different pattern.

In the main series, 4 is added to each number to arrive the next.

In alternate series, 5 is subtracted from each number t arrive the next number.


Here in the main series

3 + 4 = 7

7 + 4 = 11

11 + 4 = 15

15 + 4 = 19


In alternate series

24 – 5 = 19

19 – 5 = 14…




Read more:


Crack the series missing Number Puzzle ?


If 1 1 1 1 = R, 2 2 2 2 = T, 3 3 3 3 = E, 4 4 4 4 = N Then 5 5 5 5 = ?

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